Railway-traffic-controlling apparatus



July 22, 1930. R. M. GlLs'oN 1,771,215

RAILWAY TRAFFIC CQNTROLLING APPARATUS Filed Oct'. 9, 1929 Patented July22, 1930 UNrrEDsrArEs PATENT- OFFICE ROBERT M. GILSON, OF PITTSBURGH,PENNSYLVANIA, ASSIGNOR TO `'Ili-IE UNION SWITCH & SIGNAL COMPANY, OIE".lSWISSVALE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIARAILWAY-TRAFFIC-CONTROLLING APPARATUS Application filed october 9, 1929.Serin No. 398,309.

My invention relates to railway trafc controlling apparatus, andparticularly to ape paratus of the type involving train-carriedrgoverning mechanism controlled by energy.

received rom the trackway. MoreA particularly my present inventionrelates to the trackway portionof such apparatus, and is especiallysuitable for train control systems 'if the coded continuous inductivetype.

One feature of my invention is the provision of novel and improved'meansfor cony trolling the application of coded train governing current tothetrack. rails in `advance of a train.

I will describe one form of apparatus embodying" my invention, and'willthen point out the novell features thereof in claims.

The accompanying drawing is a diagrammatic view showing one form ofapparatus 2o embodying my invention.

Referring to the drawing, the reference characters l and la designatethel track rails of a stretch oi railway track along which trafficnormally movesin the direction indicated by the arrow. These rails aredivided by insulated jointsv 2 to form a plurality of sections, of whichonly one complete section AB, is shown in the drawing. Each section isprovided with a track circuit comso prising a track relay designated bythe reference character T with an exponent corresponding tc thelocation. The source of track circuit current for each section is atransformer 9, the secondary of which is connected across the trackVrails and the primary of.

which is supplied `with currentin the manner hereinafter explained.

Each track section is also provided with a l line relay L, a. linerepeating relay LR, and a code rela-yV. 'Each linev repeating relay LRis controlled by a front contact 8 of the asseciated'line relay L, sothat the repeating relay is energized or deenergized according as the Yline relay is energized or de-energized.v The circuit for the repeatingrelay. LR will be obvious from the drawing WithouteXplanaf tion.

Line relay L at locationA isprovided with a circuit which passes fromone terminal of VaA battery B12, through front contact 5 of repeatingrelay LR, front contact?) of track .relay TR, winding of relay L, frontContact 10 of track relay TA, winding or' relay V, front Contact 4 orFtrack irelayTB, and front Contact 6 of relay LR to the other terminal'ofbattery B12. The contacts 5 and @of the repeater relay LR constitute. apole-changer, whereby the polarity of the current supplied to relay L isnormal or reverse according` as relayV LR is energized or cle-energized,.The parts of this circuit are so proportioned and adj usted that whenthe circuit is .closed relay L will be energizedbut the code relay Vwill Vbe cle-energized, that is, the back point of its Contact 7 willbeclosed. Track circuit current will then be supplied to the primary'oftransformer 9 from terminals X and Y, which terininalsxare connected`with a suitable source 'of alternating trackcircuit current. a j

When a train entersv section A-fB, it will, oi' course, de-energizetrack relay TA, so that the front pointA of contact l0 of thisrelaywillopen and the back point of the same cont-act will close. This will cutthe line relay L out of the circuit, and will close a shuntacross thecircuit, which shunt includes a battery BG. This battery will thenassistl oroppose Y battery B12 according as linerepeater relay LR isclosed or open, .but in either-event, the code relay V `Will-becomeyclosed. If the two lbatteries oppose each other,relayVv` will closebecause of the reduced resistanceof the lcircuit due to the exclusion01' the line relay L. The desired result Vmay conveniently be accoinplished by making battery B12 a `12-volt battery, and making batteryBaa G-vclt-battery. lVhen relay V becomes closed, the

source ot trackcircuit current 'will be disconnected from the primary oftransformer-9, ,y

and train governing currentA willbe applied to l.this primary byasuitable means which forms no pa'rttofV InyA present?.invention. vTheapparatus controlledby theccde relayVmay, for example, be similar to theapparatus shown in. my rcofpen'dingf application, Serial No.171,767,iiledMarchLlQQ'Z,:fori ailway l trailic ,controlling apparatus.

Thecircuit for ytine line relay L. and .the code relay Vis'provided witha second shunt,

which includes the back point of contact 4 or" track TB. It follows thatWhen the section to the right of point B is occupied, so that trackrelay TB is cle-energized, line relay L will be fle-energized, but coderelay V Will become energized it a second train enters section A-B,because battery BG will then be connected directly with the code relayV. To put the matter in another Way, when a train enters section iti-B,thereby closing the first shunt for the line relay circuit, code relay Vwill become energized regardless ot Whether track relay TB vis energizedor deenergized.

The line relays L and the line repeater relays LR will ordinarilycontrol Wayside sig'- nals and also the train governing current, butthese features torni noy part ot my present invention, and,consequently, they are omitted from the drawing for the purpose otsimplicity.

Although I have herein shown and described only one form of apparatusembodying my invention, it is understood that various changes andmodilications may be made tlierein Within the scope ot the appendedclaims Without departing from the spirit and scope oiE my invention.

Having thus described my invention, what I claim is:

l. In combination, a stretch ot railway track divided into sections; atrack relay, a line relay, and a code relay tor each section; a circuitfor the line relay of one section including a front contact of theassociated track relay and a front contact of the track relay for thenext section in advance as Well as the Winding of the code relay for theassociated section, a source ot current ot relatively high voltage,means for supplying current of normal or reverse polarity from saidsource to said circuit according as the line relay tor the said sectionin advance is energized or deenergized, ashunt around said line relayand said front contact of the first track relay which shunt includes aback contact of said first track'relay and a source ot current ofrelatively low voltage, and a shunt around said first source of currentand the pole-chang 'ingl contacts and the front contact ot the secondtrack relay which shunt includes a back contact ot said second trackrelay, the parte being so proportioned and adjusted that said cede relayis normally open but is closed when said rst shunt is closed Whethersaid second shunt is closed or open.

2( In combination, a stretch of railway track divided into sections; atrack relay, a

line relay, and a code relay for each section; y

a circuit for the line relay of one section including a front Contactot' the associated track relay and a front contactof the track relay forthe next section in advance as Well as the Winding of the code relay torthe assoeiated section, means for supplying current of normal or reversepolarity at relatively high voltage to said circuit according as theline relay tor the said section in advance is energized or de-energized,means operating when said first track relay is open to close a shuntacross said circuit including a source of currenty ot relatively lowvoltage, and means operating when said second track relay is open toclose a second shunt across said circuit, the parts being soproportioned and adjusted that said code relay is normally open but isclosed when said first shunt is closed Whether said second shunt isclosed or open.

3. In combination, a stretch ot railway track divided into sections, atrack relay and a line relay as Well as a code relay for each section, acircuit for the line relay for one section controlled by the track relaytor the same section and the track relay for the next section in advanceand including the asso-- ciated code relay and a source of current,means operating When said irst track relay is open to close a shuntacross said circuit includilrgr a second source of current, and meansoperating When said second track relay is open to close a second shuntacross said circuit, the parts being` so proportioned and adjusted thatsaid code relay is normally open but is closed when said first shunt isclosed Whether said second shunt is closed or open.

In testimony whereof I aiiix my signature.

ROBERT M. GILSON.

